How long are old English bulldogs in heat and how often?

Old English Bulldogs typically go into heat twice a year, with each heat cycle lasting about 2 to 3 weeks. The cycle includes a proestrus phase, where the female may attract males but isn't yet receptive, followed by estrus, when she is fertile and receptive. It's important to monitor their behavior and physical changes during this time for any signs of discomfort or health issues.